Github user mattyb149 commented on a diff in the pull request: https://github.com/apache/nifi/pull/199#discussion_r51441942 --- Diff: nifi-nar-bundles/nifi-amqp-bundle/nifi-amqp-processors/src/main/java/org/apache/nifi/amqp/processors/AMQPPublisher.java --- @@ -0,0 +1,128 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.nifi.amqp.processors; + +import java.io.IOException; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.rabbitmq.client.AMQP.BasicProperties; +import com.rabbitmq.client.Connection; +import com.rabbitmq.client.ReturnListener; + +/** + * Generic publisher of messages to AMQP-based messaging system. It is based on + * RabbitMQ client API (https://www.rabbitmq.com/api-guide.html) + */ +final class AMQPPublisher extends AMQPWorker { + + private final static Logger logger = LoggerFactory.getLogger(AMQPPublisher.class); + + private final String exchangeName; + + private final String routingKey; + + /** + * Creates an instance of this publisher + * + * @param connection + * instance of AMQP {@link Connection} + * @param exchangeName + * the name of AMQP exchange to which messages will be published. + * If not provided 'default' exchange will be used. + * @param routingKey + * (required) the name of the routingKey to be used by AMQP-based + * system to route messages to its final destination (queue). + */ + AMQPPublisher(Connection connection, String exchangeName, String routingKey) { + super(connection); + this.validateStringProperty("routingKey", routingKey); + this.exchangeName = exchangeName == null ? "" : exchangeName.trim(); + if (this.exchangeName.length() == 0) { + logger.info("The 'exchangeName' is not specified. Messages will be sent to default exchange"); + } + + this.routingKey = routingKey; + this.channel.addReturnListener(new UndeliverableMessageLogger()); + logger.info("Successfully connected AMQPPublisher to " + connection.toString() + " and '" + this.exchangeName + + "' exchange with '" + routingKey + "' as a routing key."); + } + + /** + * Publishes message without any AMQP properties (see + * {@link BasicProperties}) to a pre-defined AMQP Exchange. + * + * @param bytes + * bytes representing a message. + */ + void publish(byte[] bytes) { + this.publish(bytes, null); + } + + /** + * Publishes message with provided AMQP properties (see + * {@link BasicProperties}) to a pre-defined AMQP Exchange. + * + * @param bytes + * bytes representing a message. + * @param properties + * instance of {@link BasicProperties} + */ + void publish(byte[] bytes, BasicProperties properties) { + if (this.channel.isOpen()) { + try { + this.channel.basicPublish(this.exchangeName, this.routingKey, true, properties, bytes); + } catch (Exception e) { + throw new IllegalStateException("Failed to publish to '" + + this.exchangeName + "' with '" + this.routingKey + "'.", e); + } + } else { + throw new IllegalStateException("This instance of AMQPPublisher is invalid since " + + "its publishigChannel is closed"); --- End diff -- typo "publishingChannel". Also should this throw ClosedChannelException rather than IllegalStateException?
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